/**
 * Layer 2: Claude Code stream-json output parser.
 *
 * Parses lines from Claude Code's `--output-format stream-json` stdout
 * and extracts structured [BEACON:*] markers into typed AgentMarker objects.
 *
 * This module does not import from Layer 1.
 */
import type { AgentMarker, ActivityEvent } from './types.js';
/**
 * Parse a single line from Claude Code's stream-json output.
 *
 * Each line is a JSON envelope. We only care about "assistant" and "result"
 * types -- all others (system, tool_use, tool_result) are ignored.
 *
 * Returns an AgentMarker if the text inside the envelope contains a
 * [BEACON:*] marker, or null otherwise.
 */
export declare function parseStreamLine(line: string): AgentMarker | null;
/**
 * Extract a [BEACON:*] marker from a text string.
 *
 * Marker format: `[BEACON:TYPE] {"json":"payload"}`
 *
 * Returns the typed AgentMarker if a valid marker is found, or null if
 * the text contains no marker, the marker type is unknown, or the JSON
 * payload fails to parse or is missing required fields.
 */
export declare function extractBeaconMarker(text: string): AgentMarker | null;
/**
 * Truncate a string to a maximum length, appending "..." if truncated.
 */
export declare function truncateMessage(text: string, max?: number): string;
/**
 * Parse a single line from Claude Code's stream-json output and extract
 * human-readable activity for real-time display.
 *
 * Unlike `parseStreamLine()` which only extracts [BEACON:*] markers,
 * this function extracts activity from *all* stream-json event types:
 * - `assistant` with text → first ~200 chars of text content
 * - `assistant` with tool_use → tool name + input summary
 * - `tool_result`, `system`, and other types → skipped (null)
 *
 * Activity events are ephemeral (not persisted to DB) and are broadcast
 * via SSE for real-time dashboard updates only.
 */
export declare function parseStreamActivity(line: string): ActivityEvent | null;
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